Lift for hacksaw-blades.



A.HUTTON. LIFT FOR HACKSAW BLADES. APPLICATION FILED JAN- 17, 1914.

1,150,004. Patented Aug. 10, 1915.

COLUMBIA PLANouRAPn C0..WASNINGTON. D. c

pnrinfn s' a'rEs rnrnn'r EVQFFIQEQ "AMOS HUTTON, '01? SPRINGFIELD, MASSACHUSETTS, ASSIGNOR TO MASSACHUSETTS I SAW WORKS, OF SPRINGFIELD, MASSACHUSETTS, 'AjCORPORATION F MASSACHU- 'liftinginechanism or deviceto beiused as a snr'rs.

i.,i50,00a.'

" LIFT iron Hacksaw-BLA S.

' Specificationof Letters Ifatent. Y P t t d Aug 19,1915

, Application iiieaianuaiyi'z, 1914. serial'No. 812,727.

To all whom it may cancer-12,:

Be it known that, I, Amos HorToN, .a subject of the Kingof Great Britain, resid ing in Springfield, in the county of- I'I'ampden, in the State of Massachusetts, have invented certain new and useful fiImprovements in Lifts for Hacksaw-Blades, of

which thefollowing is a specification.

This invention relates to -a hack saw machine and more particularlyto a positive partof, or in connection with a hack saw machine. I a V The operation of hack saw machines can be rendered eXtremely' -inore satisfactory and eilicient'iftlie hack sawis' positively anduniformly lifted upon its return stroke through the work. It is to acooniplishthis result ailcllfiOTQOVGl, to provide a mechanism which though simple and inexpensive will do this work in a uniformand eliicient manner, that my invention has'been developed. In connection Wltll the device I show here for causing a positive lifting of the v hacksaw mechanism, I further disclose a means for, gently easing the hacksawto' rest after it has" cut any depthrequired in the stock, and further a means for temporarily and instantaneously throwing on the lifting mechanism whenever the operator of the machine desires. I 1

In the drawings which form a part ofthis specification, Figure 1 is an elevation,

, the guide bar 3 by means ofa crank and pitman 1, 5. In the bed plate of the machine is cut a tapered hole'6,'as shown in Figfil. Through the hole 6 penetrates the lower end of the lifter bar which comprises the plunger 7, secured in a socket member 8, pivoted to the guide bar 3. Mounted upon the bed plate 1, surrounding the plunger'is a conveX washer 9, with which isassociated the concave washer 10, preferably integral with the steel bushing 11 fastened to the plunger 7. The removable collar 12 keeps these members in position. The object of this,

Fig. 2'

mounting is to allow for the necessary tilting of the hack saw during the operation of theEm-achine;

Slidableupon the bushing 11 is the cylindr-ic'al member 13 in which I have shown a conicalbushing 1 1 at its upper end, secured thereinby the cover plate 15. The conical bushing ld-is seated in a cylindrical recess such as shown. A series of steel balls 13" are located .inthe conical recess in member 13. The bottom of the cylindrical member 13 has thereupon alternate high and low portions suchas indicated by the numerals 15"and 16. The portion 16 consists of. a strip, 1 slightly greater in width than the rod 7, which extends diametrically across the circular base'portion of the member 18. On both sides of the portion 16 are cutaway portions 15", segmental in shape, which are c'onnected to the portion 16 by inclines. Sli (la,blyinounted in the bed plate 1, on op- P081176: 'sides'andadjacent the hole 6, are rods 17 and 18, the upper ends of which are adapted to bear, when in llllB'POSllZlOll shown in FigvL-uponthe portion 16. The lower ends otfthesero'ds are seated in an adjustable cari'ier' 19, between which and the movements by means of the crank 22, and a cam 23 upon the main shaft of the machine as is clearlydiscernible from the drawings. 7

Securedin 't-he cylindrical member 13 is a pin 21. i The rod 24 may be turned by hand as the structure illustrated in the H drawing is arranged for hand operation.

Threa'ded upon the socket member 8 is a stop cylinder 25 which may be adjusted in aiiy position and thereafter held there bya screw 26. I

I The operation of the machine is as follows: Periodic verticalreciprocations are communicated to the rods 17 and 18 by the mm seas will be obvious 'from the drawing. In thenormal position of the parts cylinder 13 is so held that the portions 16 thereof, rest upon the rods 17 and 18, as clearly shown in dotted lines in Fig. 1 and in full lines in Fig. 2. In this position the relative positions of the cylinder 13 and the bushing llis such that the balls 13 bear on one sideagainst the bushing 14 and upon the other against the naked shank 7. In this'position of the parts it will be obvious that the 30 come to bear upon the cover plate at any specifically motion ofthe rods 17-and 18 connected to the cylinder 13 will cause the balls l3,-to

clutch the bar 7 upon which up'ward movement of the cylinder'13 carrying the bar 7 therewith will take place, without lost motion, but allowing cylinder 13 to drop back,

as the rods 17 and 18 go down, independ ently of thebar 7 This will insurea posi-' tive lifting of the hack saw upon each return stroke. Now, however, should it be desired to, throw off this clutch "mechanism for any reason, the operator merely. turns the pin 2 1 through an angleof 90 degrees by hand or any other suitable means, whereupcn cylinder 13 is rotated and lowered upon bushing 11, so'that the portions 15' come to bear upon rods 17 and 18. In this position of the parts it is obvious that the balls 13 will rest between the bushing 11 on one hand and the washer 14L on the other, and that in this position the cylinder 13 may be reciprocated by the rods17 and 18 without clutching the shank 7, a

As is common in devices of this character, the guide bar 3 is fed downward by gravity as the saw eats itsway through the stock. I have provided adjustable stop cylinder 25 for the purpose of determining the depth of the cut to be made in any stock. By adjusting the stop cylinder 25 it will time desirechthereby automatically preventing the saw from further biting into the work. When the stop cylinder 25 has once thus come totrest on the work stroke of the saw, the saw will simply play back and forth in its out without eating the stock.

Havingnow particularly pointed out and described my invention but wishing it clearly understood that many departuresanad variations may be made from the precise form thereof without de parting from the scope of the invention which is more truly bounded and defined by the claims hereto appended, I claim:

1. In a hack saw machine, a'support for the saw, means to reciprocate the saw on 'said' support, means including a pair of ver- Copies of this patent may be obtained for 2. In a hack saw machine, a vertically movable support for the saw in combination with means for periodically raising said saw and adjustable means including a stop cylinder for limiting its movement in one direction.-

3. In a hack saw machine, a guide bar,

'means for positively periodically raising said guide bar, said means including a clutch, and means including a slidable and rotatable cylindrical member whereby said clutch may be rendered inoperative at will. a 4. In a hack saw machine, a lift plunger,

a bushing thereon, a cylinder having slidable on said bushingand formed with a recess in its upper end, a conical bushing in the recess, balls carried in said conical bushing, and means to reciprocate the cylinder, all for'the purpose described. w a 5. In a hack saw machine, a lift plunger, abushingthereon, a cylinder having a conical surface slidable on said bushing, balls carried on said conical surface, and means to reciprocate the cylinder, said balls acting to clutch said cylinder to said plunger upon movement in one direction, together with means whereby the clutch described may be rendered inoperative at will,

6. In a hack saw machine comprising a gravity fed lifter plunger, a clutch cylinder anda stop cylinder on said plunger together with means for adjusting one of said cylinders on said plunger with relation to the other. 7 r 7. In a hack saw machine and in combination a guide bar, a lift plunger, a clutch associated with said lift plunger and comprising a cylinder slidable on said plunger, steppedportions on said cylinder, rods supporting said cylinder, means to reciprocate the rods and means whereby the said rods may be brought to bear on said cylinder at different stepped portions thereof.

8. In a hack saw machine and in combination, a guide bar, a gravity fed lifting bar, a stop cylinder on said lift bar, a rest for said stop cylinder, said cylinder being adjustable with relation to said rest.

7 AMOS HUTTON.

. Witnesses: Y

LYMAN LEE, A. MAY DANCKET, G. W. DONAHUE.

five cents each, by addressing the, Commissioner of Patents.

Washington, D. C. I 

